Starrett 54416 O1 Tool Steel Flat Stock 3/8x3.5x36 in

Product Description

The STARRETT 54416 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die making, jig fabrication, and precision machining applications. Manufactured to AISI Type O1 specification, this flat bar measures 3/8 inch thick, 3-1/2 inches wide, and 36 inches long, with a thickness tolerance of plus or minus 0.001 inches and a length tolerance of plus 0.015 inches. The width tolerance runs from minus 0.000 to minus 0.005 inches. O1 tool steel offers excellent machinability in the annealed state and responds consistently to oil-quench hardening, making it a go-to material for machinists and tool and die makers building custom tooling from bar stock.

This flat stock is suited for job shops, toolrooms, and maintenance departments that fabricate punches, dies, gauges, cutting tools, and fixture components. The 36-inch length provides a practical starting blank for multiple parts from a single piece. The 3/8-inch thickness and 3-1/2-inch width make this a mid-range flat bar appropriate for medium-duty tooling applications. It is used in both prototype and production toolroom environments where dimensional accuracy before heat treatment is critical to finished-part consistency.

Key Features

• AISI Type O1 oil-hardening tool steel for consistent oil-quench heat treatment response
• Thickness held to plus or minus 0.001 inches for close-tolerance blanking and grinding applications
• Width tolerance of minus 0.000 to minus 0.005 inches ensures stock fits planned clearances
• Edge squareness of 0.003 inches per inch on all edges supports accurate layout and machining setups
• 36-inch length yields multiple blanks from a single bar, reducing material waste
• Weighs 13.38 pounds per bar, suitable for bench or storage rack handling without lifting equipment

Compatibility

Designed as a standard AISI O1 oil-hardening tool steel flat bar suitable for toolroom, die shop, and precision fabrication use wherever O1 specification material is called out.

Installation Notes

Cutting and machining should be performed in the annealed condition before any heat treatment cycle. A licensed or qualified heat treater should perform oil quenching and tempering to achieve target hardness. Use appropriate metalworking fluids and personal protective equipment when sawing, milling, or grinding tool steel. Verify finished dimensions after rough machining and before hardening to account for any distortion during the heat treat process.